CN105804748A - Method for mining hanging wall ore by subareas under open-air transportation system - Google Patents

Abstract

The invention belongs to the technical field of underground mining of metal ore deposits, and in particular relates to a method for mining hanging side ore in sections under an open-pit transportation system. In the present invention, the mining area is firstly divided according to the direction of the ore body of the hanging side mine, and the transportation road of the open-pit transportation system is used as the division standard. The hanging side mine area is used as the second division, and the hanging side mine area extending to the open slope on the other side of the transport road is divided into N mining areas, N≥1. The open pit slope is reinforced before mining, and finally divided according to the area. Starting from the first sub-area, each sub-area is mined sequentially, and in each sub-area, according to the vertical direction of the ore body, the approach filling mining method is used to carry out layered mining from bottom to top. The invention can safely and efficiently recover the hanging side mines of the open-pit transportation road, and form permanent protection for the side slope.

Description

A method for mining hanging side mines by partition under an open-pit transportation system

technical field

The invention belongs to the technical field of underground mining of metal ore deposits, and in particular relates to a method for mining hanging side ore in sections under an open-pit transportation system.

Background technique

Open-pit mining determines the final boundary according to the occurrence characteristics of the ore body and the economically reasonable stripping ratio. However, due to the irregular occurrence of ore veins, it is difficult to enclose all ore bodies within the open-pit mining boundary for mining. According to the relevant statistical data, the hanging side ore resources left under the open-pit slope account for about 5-16% of the total open-pit mining reserves. If the hanging side ore is not recycled, it will inevitably cause a serious waste of resources. However, due to the influence of the open-pit mining cycle disturbance, the open-pit slope is in a complex state of stress balance, and the recovery of the hanging side mine will produce a more complex secondary stress field, which can easily break the stable state of the open-pit slope and cause slope damage. Deformation and damage, severe cases lead to major engineering disasters such as slope instability and landslides.

At home and abroad, a lot of research has been carried out on the recovery methods of open-pit to underground hanging side mines, which mainly include open-pit and underground mining. As far as open-pit mining is concerned, it can be divided into two forms. One is to expand the final boundary of mining while ensuring that the final slope angle remains unchanged. Stripping waste rocks, exposing hanging side resources, Maanshan Iron and Steel Nanshan Iron Mine’s concave stope, Benxi Iron and Steel’s Nanfen Iron Mine belong to this category; the second is to keep the boundary unchanged, through measures such as merging or reducing the width of transportation and safety platforms , to increase the final slope angle under the condition of ensuring slope stability, and to expose the hanging side resources. This method has been adopted by Shougang Shuichang Iron Mine, Daye Iron Mine North Side Hanging Side Mine, and Canadian EquitySliverMine. The open-pit mining method of hanging side ore is usually suitable before the final boundary is formed, and when the final boundary has been formed and the working space for open-pit mining of hanging side ore cannot be provided through parallel operations, underground mining can only be used for recovery. When the open-pit slope does not need to be protected, the bottom-pillar-free segmented caving method can be used for the recovery of the hanging side ore, and the covering layer is formed through the caving slope, which not only treats the slope, but also creates conditions for the ore drawing method of the caving method. Anshan Iron and Steel Mining This is the case for the recovery of the hanging side ore, the mining of the hanging side ore body in the north wing of the Ekou Iron Mine of the Taiyuan Iron and Steel Group, and the recovery of the hanging side ore of the Daye Iron Mine of the Wuhan Iron and Steel Group. When the slope needs to be protected, the recovery of hanging side mines is mostly carried out by shallow-hole ore retention, segmented mines and other open-site filling methods and layered filling methods. Daye Iron Mine Jianshan mining area, Gushan Iron Mine hanging side mine, Banshigou Iron Mine of Tonghua Iron and Steel Group Co., Ltd. belongs to this category.

With the increase of mining depth, many open-pit mines at home and abroad have gradually turned to underground mining, such as Xingshan Iron Mine, Ekou Iron Mine, Heishan Iron Mine and Guilaizhuang Gold Mine. During the transition process from open-pit to underground mining, due to The correlation between the two mining methods in time and space, in the process of underground mining, related projects of open-pit mining can be used to save investment in underground engineering and speed up the progress of underground engineering production. For example, the ramps mined underground are laid in the open pit, and the length of the ramps can be reduced by means of the open-pit transportation system. Therefore, under the condition of ensuring the stability of the open-pit transportation system and even the entire slope project, how to safely and efficiently recover the hanging side mines under the transportation system is of great significance for reducing the mining cost of the entire mine and ensuring safe production in the mine. Although the existing methods for recovering sidewall mines also reduce disturbance to the slope by retaining ore pillars or filling goafs during the mining process, however, for the recovery of sidewall mines under open-pit high and steep slopes and transport roads, In particular, under the conditions of ensuring the long-term safety of open-pit transportation roads and the permanent stability of high and steep slopes, there are no reports on the safe and efficient recovery of hanging side mines and the permanent reinforcement of slopes.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a method for mining sidewall mines under the open-pit transportation system in partitions, the purpose of which is to safely and efficiently recover the sidewall mines under the open-pit transportation road and to form permanent protection for the slope.

The technical scheme that realizes the object of the present invention carries out according to the following steps:

(1) Mining area division: The mining area is divided according to the direction of the ore body of the hanging side mine, and the transportation lane of the open-pit transportation system is used as the division standard. The hanging side mine area under the transport road is used as the second partition, and the hanging side mine area extending to the open-pit upper slope on the other side of the transport road is divided into N mining areas, N≥1;

(2) Open-pit slope reinforcement: For the treatment and reinforcement of the open-air slope, firstly clean the pumice on the surface of the open-air slope, then construct anchor rods, hang metal mesh on the partially broken area, reserve the exit of the hanging side mine transportation roadway, and build the edge Slope protection with concrete formwork, and finally concrete shotcrete support in the remaining exposed areas of the open-air slope;

(3) Back mining of hanging wall mine: According to the regional division in sub-step (1), each sub-area is mined sequentially from the first sub-area, and in each sub-area according to the vertical direction of the ore body, the approach filling mining method is adopted to automatically mine. Layered mining is carried out from bottom to top.

According to the vertical direction of the ore body in each sub-area, adopting the approach filling mining method to carry out layered mining from bottom to top, specifically according to the following steps:

Starting from the first partition, the mining approach is designed first, and the layered excavation mining is carried out from the middle of the approach. The excavation mining rock drilling adopts the air leg shallow hole rock drilling, and the partial fan press-in ventilation is used as an auxiliary , the layout of the blastholes is the same as that of the level roadway excavation. The wedge-shaped cut is adopted, and the auxiliary holes and the peripheral holes are detonated in sequence to complete a process of ore falling. And above, manual carts are used to transport all the ore out of each caving, so as to provide corresponding compensation space for the next blasting; when the first layer mining in the middle of the first partition reaches the junction of the first and second partitions, the forward excavation is stopped. In the vertical direction of the ore body, the connecting cross roadway is opened to the junction of the upper and lower walls of the ore and rock, and the pedestrian ventilation filling shaft is constructed at the junction of the upper and lower walls of the ore and rock, and the ore slide shaft is constructed at the junction of the ore and rock of the footwall of the ore body. Set up steel arch formworks in the middle approach and connecting cross alleys, and fill them with concrete with a weight ratio of cement and tailings of 1:4, hereinafter referred to as 1:4 concrete, to form artificial false alleys. So far, the first division is completed The mining in the middle of the first layer and the construction of the mining project between the first and second zones provide conditions for the ore recovery of the upper layer;

Then, from the two sides of the middle approach road of the first layer, the approach method is used to carry out mining from the connecting cross roadway to the open-air slope with the same approach size, and mining is carried out at intervals. After the mining is completed, the pre-built concrete on the open-air slope The formwork is erected continuously on the formwork, and the entrance and exit are blocked with 1:4 concrete for filling. In order to meet the needs of ore transportation when mining other areas, the artificial false roadway of the first layer will not be filled, and the first layer of the first area will be filled. After the completion, enter the upper layer through the pedestrian ventilation filling shaft, construct the connecting cross road of this layer, and connect the ore chute and the pedestrian ventilation filling shaft at the same time, providing two safety exits for the second layer mining;

The mining work of the second layer in the first sub-area starts from the opening of the connecting roadway of the second layer, and the ore chute and the pedestrian ventilation filling shaft are respectively constructed upwards in the surrounding rock at the end of the connecting roadway of the first layer. In the ore shaft, the vertical ore body is constructed in the upper layer to connect the horizontal roadway, and the pedestrian ventilation filling shaft is connected. After the mining work of the second layer is completed, the steel arch formwork is erected and filled with 1:4 concrete to form concrete. Artificial false roadway, after the predetermined strength is reached, the second layer of hanging side mines will be mined from the middle road. The rock drilling and blasting methods are the same as those of the first layer. Put the ore chute to the first layer. After the second layer is mined, the formwork is also erected on the pre-built concrete formwork of the open-air slope, and the ore chute and the pedestrian ventilation filling shaft on both sides of the connecting roadway are connected. Connect the iron sleeve to the upper layer, and fill the inlet and outlet with 1:4 concrete and waste rock;

The mining method of the other layers in the first subregion refers to the mining method of the second layer. First, the vertical ore body construction is connected with the horizontal roadway. After the construction is completed, the steel arch formwork is erected and filled to form an artificial false roadway. After the artificial false roadway reaches a certain strength Dismantle the formwork, carry out the mining of the side road mine, and finally erect the formwork on the pre-built concrete formwork of the open-pit slope, and connect the iron sleeves on the ore chute and the pedestrian ventilation filling shaft on both sides of the connecting cross alley. In the first layer, the inlet and outlet are blocked for filling, and the previous steps are repeated until the recovery work of all layers in the first subregion is completed;

After the mining of the first subarea is completed, the artificial false roadway of the first subdivision will be extended to the border of the next subdivision, and the steel arch formwork will be erected, filled with 1:4 concrete to form the artificial false alleyway of the middle approach of the first layer of the second subdivision , because the second subarea is located directly under the transport road of the open-air transportation system, the mining construction of the second subarea adopts small-scale excavation to reduce the impact of blasting vibration, and the mining of the second subarea uses the connecting cross roadway constructed during the mining of the first subarea , ore chutes and pedestrian ventilation filling shafts are mined. When mining in the first layer, it is similar to the first subdivision. It adopts the approach mining, mining one at a time. After the last approach of stratification is mined, the joints of the connecting cross entry, the ore chute and the pedestrian ventilation patio are blocked, and the connecting cross entry and the last approach of this layer are connected to the roof and filled together. The rest of the layered mining methods are similar to first layer;

After the mining of the second division is completed, the artificial false roadway will be extended along the ore body to the boundary of the next division, and the vertical ore body will be constructed to connect the horizontal roadway, the ore slip shaft will be constructed at the footwall of the ore body, and the pedestrian ventilation filling shaft will be constructed at the ore body upper wall. Then set up the steel arch formwork and fill it with 1:4 concrete to form an artificial false roadway, and then follow the previous sub-regional mining process until all the ore bodies are recovered. After the second sub-regional mining is completed, the ore body in the lower part of the transportation system has already been recovered. It has been replaced by the high-strength concrete filling body, so the mining operations in the next sub-area and subsequent sub-areas have little impact on the slope, so large-scale mining is adopted, and 1:10 concrete is used for filling after mining is completed, until all sub-areas are mined Filling is complete.

Compared with prior art, feature and beneficial effect of the present invention are:

(1) This invention aims at the situation that the hanging side mine is affected by the overlying open-pit transportation system and must be protected during mining. In order to reduce the impact as much as possible, the hanging side ore body is divided into different partitions according to the extension direction for mining, so that When the ore body is mined under the open-pit transportation system, the previous partitions have been mined and filled to form a powerful artificial concrete pillar, which not only isolates the connection between the open pit and the internal ore body, but also provides for the recovery of the internal ore body. The conditions are met, so that the impact of the recovery of the hanging side ore under the open-pit transportation system on the open-pit transportation system is greatly reduced;

(2) Due to combined section mining and long-term weathering and rain erosion, high and steep slopes have great potential safety hazards, and the disturbance of hanging side mine mining will inevitably increase the probability of slope instability. That is, the treatment of the relevant areas of the open-pit slope not only creates good conditions for the recovery of hanging side ore resources, but also lays the foundation for medium and long-term slope maintenance, safety and stability;

(3) The recovery of hanging side mines in each section of the present invention adopts the method of strip mining, which minimizes the impact on the slope disturbance and the open-air transportation system, and at the same time uses steel arch formwork to pour artificial false roads during the mining process To a large extent, the safety of the construction is guaranteed, and at the same time, the construction of the artificial false alleyway of the contact cross alley is carried out before the mining of each layer, which also creates conditions for the blockage of the entrance and exit after the layered mining is completed, which is conducive to improving Filling efficiency, reducing the loss of filling body and avoiding the collapse of filling retaining wall.

(4) The hanging side mine is mined in sections and filled in time. There is no long-term exposure of the large empty area, and the occurrence of slope instability accidents caused by the collapse of the empty area is avoided. In addition, after the entire hanging side mine is recovered, it is equivalent to Concrete and ore bodies are used for replacement, which will form permanent protection for the slope, which is of great significance for the protection of the open-air system and the open-air slope that needs to be preserved for a long time.

Description of drawings

Fig. 1 is a schematic plan view of the position of the hanging side mine in the embodiment of the present invention;

Among them: a: open slope; b: open slope; c: open-air transportation system transport lane; A: first division; B: second division; C: third division;

Fig. 2 is the construction process schematic diagram of the mining method of the embodiment of the present invention;

Fig. 3 is the I-I sectional view of Fig. 2;

Fig. 4 is the II-II sectional view of Fig. 2;

Fig. 5 is the V-V sectional view of Fig. 2;

Among them: 1: Surrounding rock under the slope; 2: Exploration roadway; 3: Unmined sidewall ore; 4: Concrete formwork for slope; 5: Filled mining approach; 6: Artificial false alley; 8: Ore chute; 9: Pedestrian ventilation filling shaft; 10: Approach to be mined;

Figure 6 is a schematic diagram of the construction effect of the artificial false lane.

detailed description

The mining method of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples of implementation.

Example

As shown in Figure 1, it is a plan view of the position of the hanging side mine of a certain open-pit to underground metal mine in this embodiment. The lower slope extends from the inside to the outside of the open-pit upper slope c. According to the extension direction of the hanging side mine and the specific location of the open-pit transportation system above the hanging side mine, the mining area is firstly divided, and the hanging side mine is divided into A and B There are three divisions, A and C, in which A division is close to the open-pit boundary, B division is located directly below the open-pit transportation system, and C division is the rest of the ore body except the above-mentioned divisions, and there is a prospecting roadway on the side of the surrounding rock under the slope;

Open-pit slope reinforcement: before the hanging side mine is mined, the open-pit side slope near the first layer of the hanging side mine in the first layer of the A division in Figure 2 is first strengthened, the pumice on the side slope is cleaned, and the pumice is cleaned according to 2 Construction bolts with a grid width of 2m, and metal mesh for partially broken areas, use 1:4 concrete slurry to construct slope protection with 4 slope concrete formworks as shown in Figure 2, with a laying thickness of 1m and a height of 5m. Leave the exit of the roadway for hanging side ore transportation, and implement ≥10cm shotcrete support for the remaining exposed parts of the slope, and complete the side slope reinforcement work before the hanging side ore mining;

Hanging side mine mining: according to the regional division in Figure 1, each subregion is mined sequentially starting from subregion A, and in each subregion according to the vertical direction of the ore body, the approach filling mining method is used to carry out layered mining from bottom to top. Specifically follow the steps below:

The first is mining in subarea A. Five mining approaches are designed in subarea A. The width of the approach is 4m and the height is 3.5m. Starting from the middle approach, the layered excavation mining is carried out from the bottom up. The first stratum mining in the middle of the A division adopts YT-24 air leg rock drill for shallow hole rock drilling. When the mine is detonated, the ore falling operation is completed. The caving ore is transported out by a 2m ³ electric scraper. A steel arch formwork is erected in the middle approach of the layer and the connecting cross lane 7 between the AB divisions, with a width of 2.5m and a height of 2.5m, and is filled with 1:4 concrete. After the construction is completed, a concrete artificial lane 6 is formed, as shown in Figure 6 Shown, then construct ore chute 8 at the ore-rock junction of the ore body footwall, ore chute 8 cross-sectional size 2.5 2.5m, the pedestrian ventilation filling shaft 9 is constructed at the junction of the ore and rock on the hanging wall of the ore body, and the cross-sectional size of the pedestrian ventilation filling shaft 9 is 2 2m, as shown in Figure 3. After the above-mentioned works are completed, mining will be carried out on the left and right sides of the middle approach road from the cross lane 7 at the junction of the AB divisions to the open-pit boundary according to the approach method, mining one at a time, and blocking the entrance and exit immediately after mining one approach. At the same time continue the slope concrete formwork 4 in Figure 2, block the two ends of the approach to be filled, use 1:4 concrete for filling, repeat the mining process of the above approach, until all the hanging side mines in the first layer of the A division are completed recovery work;

At the two ends of the connecting horizontal lane 7, the ore shaft 8 and the pedestrian ventilation shaft 9 are respectively upwardly constructed. After the construction reaches the height of the second layer top, the second layer of vertical ore body construction is connected to the horizontal road 7, and the ore volume shaft 8 and the ore volume shaft 8 are connected. Pedestrian ventilation shaft 9 forms the second-level mining quasi-engineering. At this time, the steel arch formwork is erected, with a width of 2.5m and a height of 2.5m, and is filled with 1:4 concrete. After the construction is completed, a concrete artificial false roadway 6 is formed. The approach, and then carry out mining from the left and right sides of the middle approach, mining one at a time, and immediately block the exit of the approach after mining one approach and fill it with 1:4 concrete. The prefabricated artificial false lane 6 in No. 7 is put into the first layer through the ore chute 8, and finally transported out by the scraper. After the mining of the layer is completed, the concrete formwork is still firstly erected on the side slope to block the entrance of the road. 1:4 concrete is used for filling, and the rest of the upper part of the A sub-area is constructed according to the process of the second layer, until the mining of the hanging side mine in the A sub-area is completed;

After the mining of subarea A is completed, the artificial false roadway 6 of the first subdivision will be extended to the boundary of the lower subdivision B, and the construction will be carried out from the first layer of the connecting side roadway 7 of the B subdivision along the middle approach of the B subdivision. The width of the approach road is 4m, and the height is 3.5m. Mining to the junction of the BC division, stop further excavation, erect steel arch formwork, fill with 1:4 concrete to form an artificial false roadway, after the artificial false roadway reaches the predetermined strength, start from AB on the left and right sides of the road in the middle of the B district At the junction of the first layer of the division, the artificial false lane begins to be mined in sections with a width of 4m and a height of 3.5m, mining one at a time, and immediately filling one after another, as shown in Figure 4 and Figure 5. Section B is located under the open-pit transportation system. Small-scale tunneling is used for the mining of sidewall mines in Section B, and each footage is controlled at 1.2m to reduce the amount of charge and the impact of blasting vibration. After the mining of the last access road in the first layer of the B zone is completed, the outlet of the access road is blocked and the top filling is carried out. Here, due to the need for mining the upper part of the B zone, the first layer is not filled. The mining of the second and above layers in the B subarea refers to the mining process of the first layer, adopts small-scale excavation, and extracts one at a time to carry out mining. At the connection port of the pedestrian ventilation filling shaft, the connecting cross lane 7 of this layer and the last access road are connected to the roof and filled together, and the mining work of the hanging side mine in the B zone is completed;

The mining of subarea C also starts from the inward extension of artificial false roadway 6 of the first layer, and starts construction along the middle approach of the first layer of subarea C, with a width of 4m and a height of 3.5m. The front construction and the vertical ore body opened the connecting cross roadway 7. After the construction was completed, the steel arch formwork was erected in the middle of the connecting cross roadway 7 and the C partition and filled with 1:4 concrete to form an artificial false roadway. The ore shaft 8 and the pedestrian ventilation filling shaft 9 are constructed on the lower wall of the ore body and the upper wall of the ore body. After the artificial false road 6 reaches the predetermined strength, mining is carried out in strips on both sides of the middle approach starting from the connecting horizontal road 7, and mining is carried out every other time. , filling is carried out immediately after mining a route. Since the strength requirements for the C partition are lower in the later stage, 1:10 concrete can be used for filling to save mining costs. After the recovery of the first layer is completed, the exit of the last mining access is blocked and filled, and the mining of other layers is carried out according to the process of layer A, until the recovery work of all layers in the C area is completed.

Claims (2)

1. the method for block mining Wall ore under an open air transport system, it is characterised in that carry out according to following steps:

(1) production zone divide: according to the ore body of Wall ore move towards divide production zone, with the haul road of open air transport system for segmentation standard, haul road side near the Wall ore region of outdoor slope as the first subregion, it is positioned at the Wall ore region below haul road as the second subregion, the Wall ore region that another lateral outdoor upper side slope of haul road extends is divided into N number of production zone, N >=1；

(2) open slope is reinforced: open slope is administered and reinforces, first cleaning open slope surface Pumex, then construct anchor pole, territory, fracture area, local is hung wire netting, reserve the outlet of Wall ore haulage drift, building side slope concrete blinding bank protection by laying bricks or stones, finally side slope residue exposed region carries out concrete spraying supporting in the open；

(3) Wall ore back production: divide according to the region in (1) step by step, start each subregion is sequentially carried out exploitation from the first subregion, wherein according to ore body vertical direction in each subregion, adopts that access back-filling method is bottom-up carries out slicing.

2. the method for block mining Wall ore under a kind of open air transport system according to claim 1, it is characterized in that according to ore body vertical direction in described each subregion, adopt the bottom-up slicing that carries out of access back-filling method specifically to carry out according to following steps:

From the first subregion, first extracting drift is designed, bottom-up layered driving formula back production is proceeded by from middle route, driving formula back production rock drilling adopts gas leg type shallow bore hole rock drilling, auxiliary adopts portable blower forced ventilation, steel for shot is identical with heading pattern, adopt V-cut, via hole and periphery hole delayed ignition successively, completing the ore deposit process that once falls, first layer ore removal adopts electric LHD, the second layering and the above artificial go-cart of employing, each broken ore is all transported, provides corresponding compensation space for lower separate explosion；In the middle of first subregion, route first layer back production is to first, stop during two positions, subregion boundary tunneling forward, contact crosscut to position, rock boundary, upper lower burrs ore deposit is pulled open in vertical ore body direction, and construct People's Bank of China ventilation filling well in Shang Pankuang rock intersection, in ore body lower wall ore deposit rock intersection construction mine chute, after construction, steel arch-shelf template is set up respectively at middle route and contact crosscut, and be the concrete of 1:4 by cement and tailings material weight ratio, it is filled with hereinafter referred to as 1:4 concrete, form artificial false lane, so far, complete drift stoping and first in the middle of the first subregion first layer, two by stages adopt quasi-engineering construction operation, Ore back production for higher slice provides condition；

Then route method is adopted to carry out back production from contact crosscut to open slope direction with identical route size from route both sides in the middle of first layer, one is adopted every one, continue on the concrete blinding that after back production, side slope is built by laying bricks or stones in advance in the open erection template, closure route outlet adopts the concrete of 1:4 to carry out filling, Ore Transportation needs during in order to exploit other subregions, the artificial false lane of first layer does not carry out filling, after treating the first subregion first layer filling, a upper layering is entered by People's Bank of China's ventilation filling well, construct the contact crosscut of this layering, connection mine chute and People's Bank of China's ventilation filling well simultaneously, two extra exits are provided for the second slicing；

nullThe actual mining of the first subregion second layering is from the pulling open of the second layering contact crosscut，Upwards construct respectively in the end upper lower burrs country rock of crosscut mine chute and People's Bank of China's ventilation filling well is got in touch with at first layer，A layering contact crosscut in the construction of vertical ore body direction in mine chute，People's Bank of China of UNICOM ventilation filling well，After completing the mining preparation work of the second layering，Erection steel arch-shelf template，And carry out filling with 1:4 concrete，Form concrete manually false lane，Start back production second from middle route after predetermined strength to be achieved and be layered Wall ore，Rock drilling、Blasting method is identical with first layer，Haulage adopts artificial go-cart mode that through artificial false lane, broken ore is transported to mine chute and puts to first layer，After treating that the second slicing is complete，Continue on the concrete blinding that side slope is built by laying bricks or stones in advance equally in the open erection template，And mine chute the continue socket iron sheet sleeve supreme layering aboveground with People's Bank of China's ventilation filling in contact both sides, crosscut，Closure route outlet adopts 1:4 concrete and barren rock consolidated fill；

The back production of first other layerings of subregion is with reference to the back production mode first vertical ore body construction contact crosscut of the second layering, after construction, erection steel arch-shelf template also carries out filling and forms artificial false lane, form removal after artificial false lane reaches some strength, carry out point drift stoping of Wall ore, continue on the last concrete blinding that side slope is built by laying bricks or stones in advance in the open erection template, mine chute continue a socket iron sheet sleeve supreme layering aboveground with People's Bank of China's ventilation filling in contact both sides, crosscut, closure route outlet carries out filling, step before repetition is until completing the actual mining of the first all layerings of subregion；

nullFirst partition recovery is complete，First subregion manually false lane is extended to next partition boundaries，And set up steel arch-shelf template，The concrete adopting 1:4 carries out filling，Form route manually false lane in the middle of the second subregion first layer，Owing to the second subregion is positioned at immediately below open air transport system transfer road，Therefore，The back production construction of the second subregion all adopts little drilling depth to tunnel，Reduce blasting vibration impact，The back production of the second subregion utilizes the contact crosscut of construction when the first partition recovery、Mine chute and People's Bank of China's ventilation filling well are exploited，During first layer back production，It is similar to the first subregion，Adopt drift stoping，One is adopted every one，Back production is complete，Closure route outlet，Carry out top tight filling，After treating this layering the last item drift stoping，Closure contact crosscut and mine chute、The connecting port of People's Bank of China's vent (-escape) raise，This layer of contact crosscut is carried out top tight filling together with the last item route，All the other separate zone production methods are similar to first layer；

After second partition recovery is complete, artificial false lane is extended to next partition boundaries along orebody trend, and vertically crosscut is got in touch with in ore body construction, at ore body lower wall construction mine chute, dish construction People's Bank of China ventilation filling well on ore body, then erection steel arch-shelf template carry out filling with the concrete of 1:4 and form artificial false lane, then previous partition process for stoping process is copied, until all of ore body is reclaimed complete, due to the second partition recovery complete after, transportation system's bottom ore body is replaced by strong concrete obturator, therefore next subregion and partition recovery operation afterwards are less to the influence of side slope, therefore back production adopts big drilling depth, the concrete adopting 1:10 after back production carries out filling, until all partition recovery fillings are complete.